Java ArrayList containsAll() Method
What ia an ArrayList?
Arraylist is a part of collection framework in java. It contains some inbuilt function like replaceAll() function which can be found in the java.util.ArrayList Package.It implements the List interface of the collections framework.The arrayList class have many inbuilt methods, one of those method is containsAll() method
On this page we will discuss about theArrayList containsAll() Method
Java ArrayList containsAll() Method
The ArrayList class in java have several inbuilt methods which can be used to perform different operations. One of the method is ArrayList contailsAll() method ,which is used to check if the arraylist contains all the element of the other list/collection or not.
Syntax :
arraylist.containsAll(collection c);
Parameters:
This methods takes a single parameter collection, whose elements are needed to be checked if they are present in the list or not.
Return Value:
True : If all the elements of the collection are present in the list. False : If all the elements of the collection are not present in the list.
Exceptions:
This method throws a null pointer exception if the collection is empty.
ArrayList containsAll() Method
Example :
import java.util.*;
public class Main
{
public static void main (String args[])
{
// Creating an empty Arraylist
List < String > list = new ArrayList < String > ();
// Use add() method to add elements
// into the List
list.add ("Welcome");
list.add ("To");
list.add ("Prep");
list.add ("Insta");
list.add ("Class");
// Display the list
System.out.println ("List: " + list);
// Creating another empty List
List < String > listTemp = new ArrayList < String > ();
// add elements to listTemp
listTemp.add ("Prep");
listTemp.add ("Class");
listTemp.add ("Insta");
// Creating another empty list
List < String > listTemp2 = new ArrayList < String > ();
// add elements to listTemp2
listTemp2.add ("Prep");
listTemp2.add ("Java");
listTemp2.add ("Insta");
System.out.println ("list contains all the elements of listTemp :" +
list.containsAll (listTemp));
System.out.println ("list contains all the elements of listTemp2 :" +
list.containsAll (listTemp2));
}
}
Output :
List: [Welcome, To, Prep, Insta, Class] list contains all the elements of listTemp :true list contains all the elements of listTemp2 :false
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